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From sudhakara st <sudhakara...@gmail.com>
Subject Re: hdfs compatibility
Date Wed, 19 Feb 2014 18:10:45 GMT
Hello Anfernee,

Actually this not data migrations !! . It is upgrade. If you have to
cluster older one 0.21.0 with data and another one 2.2.0 is new. Then if
want to copy data from older to newer then it is data migration, i doesn't
require any extra care just copy data. if want change in the same old
cluster then you have to follow upgrade steps
please  refer these:
The Hadoop definitive guide - Tom white 3rd edition page -360

On Wed, Feb 19, 2014 at 4:30 AM, Anfernee Xu <anfernee.xu@gmail.com> wrote:

> Hi,
> I have an existing Hadoop cluster built from 0.21.0 release and have some
> important data on HDFS, now I'm planning to move to the current GA
> release(2.2.0), what's the procedure for the data migration(from 0.21.0
> hdfs to 2,20 hdfs) if topology is not changed(all nodes are not changed)?
> Can I simply copy all meta data files from 0.21.0(say
> /hadoop_021/temp/hdfs/namenode/) to 2.2.0(say
> /hadoop-220/temp/hdfs/namenode).
> Thanks
> --
> --Anfernee



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